i use at my ´00 gen1 both masters (cl : 15 dia & br 17 dia) of a ducati 749/999 with full success
in principal ;
the brake master is a 17 dia - the 19 dia ,
so my exp. , is good for racetracks but not for street use - they are too much biting (up to "poisonous"), so that the risk of over-braking is quite high, especially in the case of emergency/panic braking.
if an abs ist at the bike that argument is obsolete , because the abs will correct the over braking and the front wheel will stay upright.
then any size at the br master is ok even 19.
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to the front calipers at all gen1s
do a deep cleaning every 30000 km / 22000 mi -
see my page here for that - it is the pure horror what sometimes can be found there inside.
after cleaning the cals brake is wonderfull again 4 the next 22 k mi - believe me - did that job now dozens of times allways with 100% success - usually no material costs exept the dot 4 /5.1 - only ca. 5-6 h are needed .
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and a lil hint 4 the longer life of the gen1-discs :
use only organic pads - ebc are very good at all seasons - a usual rider won´t find out if they are not that much biting like full sinter.
the full/semi sinter formally "eat/bite down" the "old" gen1 - discs over 14-16000 miles down "
to the thickness of the blade of a breadcutting machine" (as we call that behavior here in germany)
and read this "only text" page 
